The tool could keep track in a ToolsDB table and provide an interface to display the data

The tool could add a comment to a phabricator task designated for tracking these actions

The tool could create and resolve a task tagged with the acl*userdisable project

The second option would be technically easiest to implement, but would not provide any search features beyond ctrl+F in-page searching. The 3rd option is close to as easy as the first and would allow more search features. Both the second and third options would allow people who were interested to receive email notifications of actions via built-in phabricator features.